I'm looking for (and struggling to find) a comparison for any e-aircraft vs. ground EV modes (car, coach, rail) carrying an equivalent payload, an equivalent distance.
So basically, if you fly from London-Edinburgh in an e-aircraft with 4 passengers... how much electrical energy would that consume vs. driving a car with equivalent passengers and luggage? so a kWh/kg-km comparison.
The plot in this article shows that on an emissions (proportional to fuel burn) basis for combustion engines that you are far better to drive (if multiple passengers), or take the coach or train vs. a domestic flight. https://www.bbc.co.uk/news/science-environment-49349566
I imagine that this relative efficiency comparison only gets worse when you switch from all combustion to all electric, as I understand aircraft are more heavily penalised by battery and electrical system volume/weight than ground transport... and the fact batteries don't burn-off mass as you dissipate energy as per jet fuel. So I'd expect the relative efficiency gap to widen.
Also e-aircraft (whether hydrogen- or battery-electric) are very limited on range/payload so for the same number of passengers it won't be able to fly as far: hence it will spend more journey time in take-off/climb than in cruise and this will make efficiency/kg-km worse again?
Would be very helpful understanding if this logic is flawed - and even more helpful if you have a legitimate quotable reference I can use!